Extending the package

As discussed in Our Concept of a Structural Equation Model, a Sem is built from one or more loss terms, and each SEM loss function bundles an observed and an implied part:

On the following pages, we will explain how you can define your own custom parts (a loss function, an observed type, an implied type, or an optimizer) and "plug them in". There are certain things you have to do to define custom parts and some things you can do to have a more pleasent experience. In general, these requirements fall into the categories

• minimal (to use your custom part and fit a Sem with it)
• use the outer constructor to build a model in a more convenient way
• use additional functionality like standard errors, fit measures, etc.